The main U.S. stock indexes plunged on Monday, weighed down by negative news about Apple and Facebook.

Facebook shares fell by nearly 6 percent in continued fallout from a New York Timesreport on the social network's aggressive response to criticism over its handling of fake news and other efforts to influence public opinion. Apple shares fell by 5 percent after a Wall Street Journalreport that disappointing sales had prompted the company to cut orders for its latest iPhones. Shares of Google-parent Alphabet also fell by 4 percent.

The Dow Jones Industrial Average closed down by 1.6 percent, while the tech-heavy Nasdaq Composite lost 3 percent and the S&P 500 dropped by 1.7 percent. Stock futures fell further early Tuesday, Fox Business reports, suggesting more tech-fueled selling. Harold Maass